Today's pocket PCs are probably too slow to run 68K games the way they are emulated in MAME. I don't say that if somebody makes dedicated ASM coded 68K emulator for Pocket PC it won't be possible. I remember Techmaster once enabled Marble Madness (one of the first and simplest 68K games) and he said it was way to slow on iPAQ.

On the other hand, author of MAME for Digita cameras said he enabled NEO GEO driver and with some tweaks made Puzzle de Pon work at acceptable speed. So there's still hope!